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Significant accounting policies and recent accounting pronouncements (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Change in Accounting Estimate [Line Items] |  |  |
Deferred revenue | $ 6,523 |  | $ 7,229
Increase/ (Decrease) in trade accounts receivable | 8,572 | $ 7,843 |
Increase/ (Decrease) in deferred revenue | (1,843) | (197) |
Restricted cash, current | 10,425 | 12,120 | 7,169
Restricted cash, non-current | 11,420 | $ 8,420 | 8,420
Cash and cash equivalents | $ 218,651 |  | $ 257,911
Revenue recognition method | straight-line basis |  |
Effect of Adoption of ASC 606 |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Deferred revenue | $ 3,798 |  |
Deferred expenses | 2,561 |  |
Increase/ (Decrease) in trade accounts receivable | 6,187 |  |
Increase/ (Decrease) in deferred revenue | (706) |  |
Ballasting cost incurred during backhaul voyages | Effect of Adoption of ASC 606 |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Deferred expenses | 1,229 |  |
Voyage expenses | Effect of Adoption of ASC 606 |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Deferred expenses | 1,151 |  |
Charter-in hire expenses | Effect of Adoption of ASC 606 |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Deferred expenses | $ 1,410 |  |

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